

index. F\ 429 



Page. 



Formation VIII a, Upper Helderberg. 



•' improperly recognized in the limestone under 500' greenish slates of 



VIII 6 2, 191 



" no Corniferous fossils found in VIII 6, 2, 3, Madison t., 260 



Formation VIII b, Marcellus limestone and black slate. 



" described, 64,65 



'• only seen in few places in Centre t., 190 



•• well developed at M. Barnett's, .... 190 



" where well developed, no iron ore, 191 



• not well exposed in Greenwood t., 218 



" Local sandstone, at bottom, at Montebello narrows, 269 



' ; rich in brown hematite iron ore in Oliver t., ....... .278 



" whole formation absent in Rye t., E. of Sterrett's gap, 309 



" sulphur spring near Sandy hill, Saviile t, . . 325 



Group of VIII b i, Marcellus lower iron ore. 



" 2' worthless; only ochre beds, '. . . 64 



" see Iron ore over VII, 187,188 



Group of VIII b 2, Marcellus lime shales. 

 " 50', described, ...... 64 



" hard close-grained sandstone at the bottom, in one locality in the 

 county, at Montebello narrows, 269 



Group of VIII b 3, Marcellus limestone. 



" 50', described, 64 



" won't slack, in Centre t., , 190 



" exposures abundant and complete, in Madison t., 260 



" very interesting fossils ; no corniferous forms, . 261 



" fragments numerous at X. end of Pine Grove narrows, Miller t., . 269 



" 50' hard beds ; Gibson's mill, Spring t., 339 



" well exposed, but elsewhere much covered up, ... 339 

 " fragments of trilobites (Dalmanites?) Gibson's mill, Spring t., 339 



" not seen in Tuscarora t., ... 364 

 " sought for but not found at the Half Falls, although reported inGeol. 

 Pa., Vol. I, p. 138, 379 



< rroup VIII b h Marcellus Upper iron ore. 



" described; brown hematite ore, 64,94 



" in Center t., described. . . . . 191 



11 Lewistown ore bed, local name, 191 



" normally 50' over top of VII, . . 191 



" abundant when limestone is poorly developed, and vice versa, 193 



" Barnett's mine, Bloomfield, ..... 193 



" Long's mine, Center t., double bed, 4' to 14' thick, parting of clay; 



100 wash tons per month ; price at Newport f 3 50, 194 



" changes in the deep to blue carbonate ore, 194 



" outcrop near Perry furnace ; also X. of Bloomfield, 195 



" 1' to 3', at Tralltwine's mine, Greenwood t., 219 



" sent to Maria furnace, 219 



" fine display on road in Madison t, 263 



" fills fold in VII, Inoculate synclinal ridge, 268 



" rieh in Oliver t.— smelted at Newport, 278 



" outcrop near Sandy hill, Saviile t., less striking, 325 



